To use the TestKit, include the following in your plugin's build:

.Declaring the TestKit dependency
====
include::sample[dir="snippets/testKit/junitQuickstart/kotlin",files="build.gradle.kts[tags=declare-gradle-testkit-dependency]"]
include::sample[dir="snippets/testKit/junitQuickstart/groovy",files="build.gradle[tags=declare-gradle-testkit-dependency]"]
====

 * limitations under the License.
 */

package org.gradle.testkit.runner.enduser

import groovy.io.FileType
import org.gradle.test.precondition.Requires
import org.gradle.test.preconditions.IntegTestPreconditions
import org.gradle.testkit.runner.fixtures.NoDebug
import org.gradle.testkit.runner.internal.DefaultGradleRunner
import org.gradle.util.internal.GFileUtils

import org.gradle.testkit.runner.GradleRunner
import org.gradle.util.internal.TextUtil
import spock.lang.Issue
import spock.lang.TempDir

@Requires(UnitTestPreconditions.NotWindows)
class ConfigurationCacheTestKitIntegrationTest extends AbstractConfigurationCacheIntegrationTest {

    @TempDir
    File jacocoDestinationDir

import org.gradle.test.fixtures.file.TestFile
import org.gradle.testkit.runner.fixtures.CustomDaemonDirectory
import org.gradle.testkit.runner.fixtures.CustomEnvironmentVariables
import org.gradle.testkit.runner.fixtures.Debug
import org.gradle.testkit.runner.fixtures.HideEnvVariableValuesInDaemonLog
import org.gradle.testkit.runner.fixtures.InjectsPluginClasspath
import org.gradle.testkit.runner.fixtures.InspectsBuildOutput

tasks.jar {
    into("org/gradle/api/internal/runtimeshaded") {
        from(generateTestKitPackageList)
    }
}

packageCycles {
    excludePatterns.add("org/gradle/testkit/runner/internal/**")
}

tasks.integMultiVersionTest {
    systemProperty("org.gradle.integtest.testkit.compatibility", "all")
}

// Remove as part of fixing https://github.com/gradle/configuration-cache/issues/585
tasks.configCacheIntegTest {

import org.gradle.testkit.runner.BuildResult
import org.gradle.testkit.runner.BuildTask
import org.gradle.testkit.runner.GradleRunner
import org.gradle.testkit.runner.InvalidPluginMetadataException
import org.gradle.testkit.runner.InvalidRunnerConfigurationException
import org.gradle.testkit.runner.TaskOutcome
import org.gradle.testkit.runner.internal.DefaultGradleRunner
import org.slf4j.LoggerFactory

    }

    static String functionalTest(String content) {
        """
            import org.gradle.testkit.runner.GradleRunner
            import static org.gradle.testkit.runner.TaskOutcome.*
            import spock.lang.Specification
            import spock.lang.TempDir

            class Test extends Specification {

import org.gradle.test.fixtures.file.TestFile
import org.gradle.test.fixtures.file.TestNameTestDirectoryProvider
import org.gradle.testkit.runner.BuildResult
import org.gradle.testkit.runner.TaskOutcome
import org.gradle.testkit.runner.internal.ToolingApiGradleExecutor
import org.junit.Rule

/**
 * For these tests to run you need to set ANDROID_SDK_ROOT to your Android SDK directory
 *

        }
    }

    public String getDescription() {
        // It's true right now that this is always coming from the TestKit, but might not be in the future.
        return "Gradle TestKit";
    }

    private static class InjectedClasspathPluginResolution implements PluginResolution {
        private final PluginImplementation<?> plugin;

 * limitations under the License.
 */

package org.gradle.smoketests

import spock.lang.Issue

import static org.gradle.testkit.runner.TaskOutcome.SUCCESS
import static org.gradle.testkit.runner.TaskOutcome.UP_TO_DATE

class ProtobufPluginSmokeTest extends AbstractPluginValidatingSmokeTest {

    @Issue("https://plugins.gradle.org/plugin/com.google.protobuf")